Heater housing



FIG. 1 is a top perspective of heater housing showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a side elevation view thereof, the opposite side being a mirror image thereof.

The bottom and portions of the rear which are not shown in the drawings form no part of the claimed design.

The broken lines immediately adjacent the shaded surfaces represent the bounds of the claim while all other broken lines represent environment. None of the broken lines form any part of the claimed design. 

The ornamental design for a heater housing, as shown and described. 